Power & ET Estimate for my 347 stroker?

[norcalsvt]

It's been a little over a month since I bought this 68 coupe with a 347 stroker. I remember when I asked the seller about the horsepower estimate & et he told me the shop that built the engine said approx 420 hp & 1/4 mile around high 11 or low 12's. The seller never had it dyno'd or tested, but he said he didn't know if they were true or not. I had a 2000 Lightning for 4 years, so trying to compare, it seems like this stang is alot faster, but I really don't know. Sold the truck, & I'm really just guessing anyways.
This is what's on the car now:
347 Stroker
New 302 block Bored .30 over
Decked & Blue printed
Eagle Rods/Crank
Keith Black 10.2 to 1 Pistons
302 Heads Pocket Ported
Itsey 270 Mega Cam
1.94 Intake Valves
Com Cam Roller Rockers
Speed Demon 650
Edelbrock RPM Air Gap Manifold
MSD Ignition w/6A Box Blaster SS Coil
Hooker Comp Headers
TCI Streetfighter C4
8" rear posi .355 gears
Also, anything that you think I should change. I feel it needs a tune, b/c the gas smell in the garage after I drive it into the garage lingers for hours.

 

[302 coupe]

I doubt it makes that much power with those heads, I'm thinking maybe 350-360 horses. With some AFR's, you'd be easily over 400 hp. On street tires I would say low 13's at best in the 1/4.

 

[Ronstang]

I agree, if it is on stock heads it won't be making much more power than a 302, in fact I have seen 347s with crap heads make less power than a 302 with decent heads. Airflow is king....if you want to make power then get those heads replaced as soon as it is financially feasible.

 

[norcalsvt]

I doubt it makes that much power with those heads, I'm thinking maybe 350-360 horses. With some AFR's, you'd be easily over 400 hp. On street tires I would say low 13's at best in the 1/4.

I always wondered why the guy spent $8000 on the engine work w/parts, yet used 302 heads. He told me they are supposed to flow extremely good b/c of the pocket porting. He said I spared no expense when it came to the engine, although he couldn't answer why he didn't buy some aftermarket heads instead. I forget the exact amount he told me it cost to do the work on the heads, but it seemed expensive.

I'm going to look into the AFR's

 

[allcarfan]

Depends on how good the port job is too. However, you swap to something really basic like an edelbrock performer head....you would pick up GOBS of HP with that combo. Conservatively, i can see 350hp or so. 1/4 time will depend on how well you can drive and what kind of traction you can muster.