I’m gunna crawl around in there too in just a bit. I like the idea of being able to utilize the block I already have, a dollar saved is a dollar I can spend on something else for the truck! Come New Year’s Day I think I’ll start the tear down process, I mainly want to pull the truck back out of the weeds again, kick the pack rat out of his house in the engine bay and start the drive train removal process/ or start stripping the interior, I’ve definitely taken notes from the Piggott kids build.The f.e. series engines all shared the same basic block with a few exceptions. Like the 427 side oiler, s.o.h.c. , and industrial applications. Trucks and passenger cars all used the same basic block with different crank and piston combinations to achieve varying displacement and power levels. 500 horsepower is easily achieved with a pump gas build. There are quite a few f.e. builds in the 700 plus horsepower range naturally aspirated on race gas. One of the features of these engines is shaft mounted rocker arms which add stability to the valve train at higher r.p.m. without the need of high dollar valve train components. I'm not trying to steer the o.p. in one direction or another. But the ability to get large displacement in an engine package that is only slightly larger and heavier than a small block was appealing to me for my truck. Check out survival motorsports and the f.e. power forum. They can better explain this than I can.