Before I bought the stroker I ran my old L48 engine with flat tops and edelbrock RPM heads and the mild performer cam. It was a fun engine for what it was... with that broomstick cam it would die at 5000rpm but it pulled hard from idle... a nice street setup for the money.
Did you ever look at your bores ? If the bores are clean and have no taper then you can just use the bottle brush and pop new pistons in there.... forged pistons need more skirt clearance, that could play in your favor...
With the time effort and money you're spending on this I'd not use the flat tappet cam.... a roller cam incl V6 lifters is only $400, maybe another $50 for the spider hold downs....
Your Edelbrock heads fit a 350 better than a 383, depending on cam it might be the better choice. The 383 or 396 stroker will be choked by these heads, again, with a milder cam not as noticeable... now if you choose a solid roller with 248-250 duration it won't work with these heads...
There are so many options, they actually wrote books about building engines :bump::3rd: