Hey guys, after a 5 year hiatus while I went to school, its time to get back at my '46, specifically the powertrain. I have 2 engines I can use, an early 90's TBI 350 from a wrecked pickup and a '72 400 small block from an Impala. Both engines were in good running condition when pulled, and both are under 60k miles. I am looking for a combination that is around 400-450hp, is RELIABLE, and will get the best mileage, although I realize it won't be great with 400+ hp. Two combinations with these motors is a 377 (400 w/350 crank) and obviously the 383. I know of lots of 383's out there, but anyone have experience with a 377? What about heads? Is this a realistic power expectation with just a cam/induction/headers? I am not against going to aftermarket heads if thats what it takes. Any opinions or input is greatly appreciated.