opinions welcome on build.

Agree with PRH
no need to fear the stroke or rod ratio
go for cost effective big cubes and build from there
THIS
"that another/different set of expensive reworked stock heads may or may not make more power."

Heads are where the top end power is and you get about the same top end power with 370 or 426 cu in
but you get a lot more midrange with the big motor
and do not have to rev as high and do not have to have a cam that has to have high revs to work best.