400/450 stroker....Cheap parts, lotta work.
"Hey Cody.......Lest I screw up all your work on these heads........do we have another 346 head I can get some internal measurements from?"
"Yeah Dad......There is another 1973 400 out back that should have 346 heads on it. I'll fire up the forklift and we'll bring it in. We'll use it to build the 400ci engine we've been talking about and pull a 346 for you to destroy. We have a plethora of 906 heads and we can make a pair of those for the 400."
A little snip here and a little snip there..........and voila.......
A measurement here and a measurement there and I figured he'd done a pretty good job already. No sense in accidentally punching a hole in his work or coming across a casting flaw. SO LEAVE THE HEADS ALONE!