Swaping heads, cam, and torque converter.

You should be in the area of 1.0 to 1.2 fwhp per cubic inch. Is it a bored 289? That sould make it a 296 or something. With those heads and a healthy cam like that the small displacement is going to really hold you back. Put that same combo on a 351W and you be at or just over 400fwhp

wierd combo....

way too much stall, exhaust too small, too much cam, and a 100 shot wont last long on that engine. Especially being bored as much as it is.

you have too much intake too man!

If your goal is simply 350-360 at the flywheel....

TW heads, an xe266H cam, speed demon 650, 1 5/8 comp headers, 2.5" exhaust, RPM intake (notched) and port matched. You only need about a 2500 rpm stall converter. Your combo is a little more radical and your parts really dont match up well. The combo I stated above made 396hp on a 306...naturally aspirated. Only difference was...it was a roller block.

Shane

I wouldn't sweat the 100 shot, the motor will take more than that, it is the rear end I'd worry about. A vic jr is a little much. The rpm intake out of the box would do much better with the 274. If the converter is an off the shelf converter, I doubt it will go 3200. Those stall #s are optimistic on a small v8. I'd be suprised if it went 2700. All but the intake, I say go for it. It aughta haul!

to really take advantage of your combo...jump up to a 650 speed demon, 2.5" exhaust, and very mildy port the heads...you should be making damn close to 400fwhp

The tri-Ys are great for building torque when you have little displacement, they are not know for good numbers at high RPMs compared to 1 5/8 equal length designs.

600cfm is too small for such a big cam/head/intake combo. Try a 725 Holley or 650 Demon. I don't want to start a religious war but I'm not a fan of edelbrock (carter) carbs for high performance applications.

The stall is abit high for a dual plane manifold but I think about right for the Victor. I see you are considering the air-gap, I'd go with a ~2800-3000 stall if you stay with the 274 cam. If you go with the 266 cam then get a 2800.

The 2.25 exhaust is pretty small for serious power but will help build torque. it is a trade-off only you can decide. I put a 2.5 inch exhuast into mine when common wisdom says I should use a 3" since I want booku bottom end.

I like all of ALLCARs suggestions except porting the heads. Those are already big heads for a small displacement motor IMHO.

Getting a true 400fwhp out of a 289 is going to cost you streetability. If you are heart set on that number seriously consider a stroker.

PS. Did you really punch that 289 out to 60? You may have cooling problems if you get the power numbers you are talking about. The SBF is not very happy when over bored that much. I think it may be time for you to look into a 351W block. Stroke it out to 427 and with the mods you already have you're at 500fwhp and very streetable.