Hey Bobby,
Sorry I don't have a good site for deciphering the numbers on your engine. If I find one, I'll let you know.
I think a 351W will be cool in your 37, especially with the T5. You probably know this already but you'll probably have to have the rear sump oil pan & pickup tube. They came on 80's F150 4x4'x and E150 vans, maybe 90's too.

Your firewall will need a bit more modification too. Are you going to modify the original one or go for the aftermarket? As you probably read in my thread, IC2 recommended that I get the big-block firewall for more clearance behind the engine. I'm glad I did but it make it a tighter squeeze for the clutch/brake/gas pedals.

Later,
Randy