To much cam??

WARLOCKII said
The engine is bored .030, 9.5 flat top pistons (cast), stock 906 heads (new valves, seats, 3 angle valve job) no port work. Edelbrock dual plane intake w/ 750 carb. The cam is a Comp 284H (484 lift, 104.0 intake centerline, duration @.050 lift 239int, 246 exh, lobe seperation 108.0). 2400 stall conv. and Schumaker headers with dual exhaust. The cam and crank gear marks were aligned when installed and the balancer is 1-2 degrees from being dead nuts on.

The issue is the engine only develops 5-6 in. vacuum at idle (15 deg.initial timing) and 10-12 in. at 3500 (34 1/2 deg. total timing). If I give it more initial timing the vacuum will increase but I end up around 50 deg. total timing. The PB hardly work, it wants to die when put into gear (unless I turn the idle speed up).

Why are you running vacum advance. Dissconnect it adn set your timing at 19 initial and 38 total. See if things improve. If they do it wants more initial. Get the dist re-curved.

What does it idle at?

Were your pistons for the open chamber 88+cc heads?

I've never had great luck with the eddy carbs. Have you tried anything else?

the cam isn'ty too big but the specs are not going to yield pleasant street manners and it isn't cut for a mopar. small centerline, moderate duration and tiny lift = not good.

Another thing you have to consider is that you really don't have a big block. You have a physically large block with small block cubic inch. Anycam you put in it will seem a little biger than say somthing 100 cubic inches bigger.

MTmopars said
Seems light on the stall converter for that cam.

3500 would seem more appropriate and if it's a quality converter (I use an Art Carr) you won't even notice it.