My current cylinder heads have a 60CC chamber and yeild an approximate 11.2 to 1 compression ratio with the 346CI stock bottom-end.

If I swap out the bottom-end for a 383 stroker with flat top pistons, and use my existing 60CC heads will my compression ratio increase - all other things being equal (the same)?

In other words, will my stroker have to have dished pistons if I want to build a pump-gas friendly street car motor?

 

Yes, the compression will raise without dished pistons or a piston that sits further down in the bore.

Adding the 4" crank with flat top pistons with the same deck height will put you up around 12.3:1 cr.

If you get pistons with a 7cc valve reliefs that'll bring you back to around 11.2:1 cr with the 4" crank.

 

I suppose the other option would be to increase the head chamber size by 7CCs.

 

Yep, that would work also.