67' c10 w/ 327

I am having a bit of a prolem with my truck, it just doesn't run like it should. I have dinked with engines for quite a few years, but I am by no means an expert. I bought the truck with its current motor and trans, so I am not 100% on some of the specs. But here it is, 67' 327 with what sounds like an RV cam, brand new(not rebuilt) Holley 600cfm w/ vacumm secondaries and electric choke, Holley dual plane intake, GM HEI ignition, and dual exhausts, no headers, also with a TH350 trans, 411 rearend(open). Here is the problem, it idles in park and neutral fine, but when you put it in gear it all but dies. To make it idle in gear the idle mixture has to be set very rich. The timing is set at 16 degrees advance at idle, and with a shorter mechanical advance overall. Thats not the only problem, since I have had it, it has poweer issues. Even with the open 411 rearend, from a stop, with an empty shortbox I can not even break a tire loose. Pretty sad I think. Everyone who has owned a 327 can't beleive it. By the way the motor revs and run great in park, and has good compression, but when I'm driving it lugs its way up to speed.

sounds like it may have too much cam for the motor,an automatic will idle higher in park or neutral than in gear, the cam may just make the idle drop so much in forward or reverse gears but not in park or neutral when it naturally idles faster. you could turn the idle up a little to compensate.

What do the plugs look like ?

:confused: sounds like to me you might have a timing problem, but you say, The timing is set at 16 degrees advance at idle, and with a shorter mechanical advance overall, im not sure what you mean there. do you mean that the mechanical advance is less than 16 degrees? i dont know what the idle timing is but 16 base timing is to much. how have you got your vac. adv. hooked up?check these things first. get your base timing right(8-12 degree)make sure your vac. adv. is hooked up right and check and make sure your mechanical adv. is not froze up (some time the hei weights will freeze up, take the rotor button off and clean the weights), hook the vac. to the dist. so you will have vac when you give it gas, not idling. pick up the vac. above the carb. betterflys. the idle problem could be a low vac. thing also. have you checked to see how much vac. the motor is pulling? get your timing right and see what you have, check you vac. let us know what you got. **) **) **)