Yepper I missed the part about your block being .040 over for it to end up being a 384.Still the DCR formula you want to apply to end up no more than 8.5 for pump gas.
The Ryan's web page for 108 SBC builds is dated now.

Richard "Techinspector 1" does have some very good advise. Two resident engine builders on here is Pat and Jerry.

I like the choice of a 180cc intake runner for low end grunt,but your are going to find it has it's limits for top end HP. With 383's you can go to the 195 to 200 CC heads.

To to clarify,have you started this build yet or any part of it??. Is your 350 a roller block from a truck L31 1996 to 2000 yr.

You didn't say or I didn't see anything about decking the block.

Got to run for now,I'll check back later.

BTW-if you haven't started anything yet,you might want to see what Pat could do for you in a short block.