Bored and sleeved Canadian block with stroker kit.
Here's the '38 Ford of a guy I had known since high school. It ran a Canadian block flathead, bored and sleeved with stroker kit, track grind cam, three Stromberg 97s - a popular configuration for flatheads.
http://dirtfans.com/RonDolen.html
The first time I met him he was going to beat the crap out of me because I'd strayed into his neighborhood when I was hitch hiking home. One of his buddies knew me and vouched for me, saving me a lot of grief. We became friends, and remained so for years.
He loved racing and stayed in it clear up to when he was too ill to continue.