Re: 400 Block 350 Crank ????
Bob the 377 is a good drag racing and road race engine if you like small blocks. Eagle makes a 350 stroke crank 3.48, with 400 mains so you don't need special bearings on the mains. The price is very reasonable $325. It is forged steel for use with 6.0 rods on the 377, x-rayed, magnafluxed and sonic tested, nitrided, .125 radius on the rod and main journals, cross drilled and chamfered oil holes, stress relieved and shot peened. Eagle part number is 440034806000. You could use KB hyper pistons part number KB195-30 for the 377 and 6.0 rod, I've seen these go for $280. with 64cc heads the comp is 12.1:1, using the larger 76cc head you'll end up at 10.5:1.
Here is an example of a typical 377 build up using Victor Jr aluminum heads, Isky solid roller 264/277 cam, Victor Jr intake and BG 750 annual discharge carb the engine made 589 hp @ 6500 and torque peaked 516 @ 5200. At 4800 torque hits 508 and HP is 464, at 5200 516 torque, 510 hp, torque stays above 500 until 6100, at 7000 torque is 432 and hp is 576.
The relatively narrow spread between peak torque and peak horsepower of 1200 rpm would work well with a 4 or 5 speed. But on the street this will be a handful to drive, fun but a handful unless you are only taking it out on weekends. If you choose an auto you'd better plan on at least a 4,000 stall converter, 5,000 to drag race it with an auto. Like the others said run steep gears. I plan to build one of these except with a 3.00 or 3.25 crankshaft and really steep gears.