Since there are some widely differing opinions on stroke, i ran a simulation on Engine Anyliser. Basically the more stroke the merrior between 1500 and 4000 rpm, right where most street driving is going to be. If you want to get crazy, a 4.5 stroke crank went up to 510 ft lbs tq at 3000 rpm versus 400 at stock stroke.
The cam was critical. Duration at 220 to 224 on both sides worked well. Peak hp landed at 4250 with a 4.25 stroke. These calcs were done assuming stock everything but cam and carb. An engine built like this would need a very tight converter like a 2200 to 2400 stall. 3.55 max rear gears, as it runs out of breath at 5000.
The key to best performance would be invest in some aftermarket stock appearing heads with a little bowl work done on them. Some tricks to a stock intake might pay great dividends, (open plenum?) And the best flowing mufflers are a must to not choke off the top end power.