W2/W5/R3 Engine Build Opinions Needed

I'll stab at this................
R block for sure, if you can find one. I run a 'repro', and it's everybit as strong, IMO. If available, go with the 48 degree. Eases use of roller lifters. Ryan did have a selection of blocks lying about. Ask him.
As far as heads. There's lots of options. Seems the W5's and Indy's are commonplace, and 7 and 8's abound at good prices. That mixture would make for easy hp and torque............. JAT.