Flathead4d, that is B-yutiful! However, I would have used a 3 5/16" bore instead of the all out 3 3/8" bore, that may be the last time you can bore that block now, although I have seen them bored to 3 7/16", but that assumes a perfect positioning of the cylinder cores in the block which is usually very iffy. Anyway if you take care of it and use a stiffer rear gear like a 3.54 you may get a lot of reliable miles from it. Where did I read about a guy who was going to replace a flathead anyway so he put a brick on the floor pedal and let it run at WOT until it overheated and stopped; then an hour later he found it started right up again, so they can be tough but overheating will eventually lead to cracks somewhere in the block. Still that picture makes it look easy to get a strong flathead setup but as Tech1 said you can easily get a SBC set up for close to 300 H.P. for under $2000.

Don Shillady
Retired Scientist/teen rodder