Timing for a not so stock Chevy Small Block?

I got this 71 nova and it seems so hard to keep it running. It spits and sputters when its out on the road (kinda cold). It only idles when hot. The motor is a 73 350 bored .40 over, 9.5 - 1 compression, comp cam 270h lifter set, 883 casting cylinder heads with 2.02/1.60 valves, z28 valve springs, aluminum full roller rocker arms 1.6 ratio, MSD ignition (box, coil, distributor). The intake is a Edelbrock tunnel ram with 2 holley 450 carbs, it is cooled by an electric cooling fan. It has a 3000 stall converter on trans and the rear end is a Auburn 4.11 posi. The jets in the carb are 2 sets bigger (richer) and the spark plugs are 2 levels colder becuz it is equipt with NOS. Last time i looked the timing was 12 degress before tdc. I dont know if thats what it should be with all of this stuff added on does anyone have a clue where it should be atleast close to? Also ive been trying to get a clue on how many horses this thing is putting out any rough geusses?

883 casting ?, new one on me:HMMM:

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Originally posted by viking
883 casting ?, new one on me:HMMM:

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Me too.

........when I first read the post, I was thinking how restrictive 882's were to the listed combo, and replacing them with better flowing heads would be MY first order of business, then I caught the 883, ............typo ? :confused:

First check for vacuum leaks. New plugs next, then wires.

First off the plugs dont look that bad ,nice soft brown little bid of black but i thought that would be because it is set rich for the NOS.
Once the car get to like 185 190 Degrees it runs pretty good, but then warm ,cold getting it started again is the pain, Like i said Timming last checked was 12 Before TDC, Is this close to what it should be?
As far as the 883 casting heads, This is what i have gotten from the prior owner so i have no idea what he means. it is supose to be a list from the engine builder which is in Utah.
What is a 882as mentioned or 883 casting head?????
As wires go it has the MSD 8.5 supper conductors these are all new.

This motor has little more than 1000 miles on it. Timming is my thouht, as it sits right now 12 degrees before TDC is all it can go because the vaccum advance hits the tunnel ram so if it needs to be closer to 3 or 4 degrees i will have to jump teeth on the distributor.

Any guess on HP??????

Ok I think i have got the casting number thing fiqured out.
Yeah the heads cant be 883 or 882 for that matter these are suppost to have 2.02 and 1.60 values. I believe i have top pull the value cover to get the casting number off the head is this correct?

Also guys do any of you have any reference books that show a long water pump Number 3927170? Dated A18 9. One guy told me it was not in any book or listed anywhere.

Thanks,,