Dual Holley vacuum secondary 390's with stock jetting on a dual-quad tunnel ram 289 intake, on a 5.0L H.O. roller cam. Cam specs are .471/.441", 219/209 @.050, 115 deg sep.

Just fired her up today. (Finally!) Runs KILLER, amazing throttle response (roller cams are COOL), lays rubber like a bad dog.

Except the only way it'll idle is at ~1500, with the timing WAY advanced -- 20-30 degrees.

I had this exact induction on a '78 306 flat tappet block / cam and had a 700-800 rpm idle. That was with a cam that wasn't as "plickety." I've double and triple-checked for vacuum leaks.

Am I stuck with this idle? Would rejetting help, and if so, would I lose some of that killer throttle response?