What i have is a 1972 dart swinger with a .030 over, cast crank 440. It has the TRW 2355 six pack pistons with compression height of 2.062. Open chamber stock 452 heads. Compression ratio is right at 9.4:1. It has the mopar performance 284/484 cam installed 4 degrees advanced. Stock intake and a built thermoquad. 1 7/8 hooker fenderwell headers. I have the distributor dialed in at 18 degrees initial and 32 total. I have not been running the vacuum advance..but should i be? I didnt think cammed up engines were supposed to run the vacuum advance but been hearing conflicting things about it..