mtrain
+1y
The firewall issue will be the same.
Now I'm a Ford guy, and I already have a twin turbo setup behind a 363w stroker, but if I were you I would build a 351w.
A stock block can take around 800hp {74, and earlier}, more cubes, taller deck height for more cubes if desired.
It would be about the same difference to do the 351w as the 302, its the bell housing that makes you have to ding the firewall.