Power & ET Estimate for my 347 stroker?

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 said:

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.

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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