I want to build a Chevy 327 - need tech help

[naphtali5725]

Hello all (Keith can you chime in man),

I would like to build a 327 for my 67 GMC stepside with 3 on the tree.
I know a lot of folks are going to say go with a 350, 383, ad infinitum...
I want a 327, so...
Is it possible to build one out of a 350 block with a one piece rear main seal? If yes, what would I need to do to achieve it, what are you guys opinions on crank/rods/pistons?
If not, I know 327 blocks are scarce usually, and I'd rather have a 4 bolt main block so the 350 two piece rear would be my second choice. Again, what are you guys opinions on crank/rods/pistons?
If you tell me to just search search search etc. then that's not the point of asking the experts here for technical help, so only sincere opinions would be very much appreciated.

Kindest regards