So I'm trying to figure out what size jets I need and tune for my 355. The carb is a Barry Grant750 dp. I need to what jet sizes and a tune.

The motor specs are 355 with gm041 heads with work done to them, 454 lift cam on both and 272 duration on both, it's got a torquer 2 intake on it. Its got 10:1 compression and full msd with 34* of advance. Got full length headers also.

Drive train is a turbo 400 with rmvb. It's got a 3000 stall. The rear has 373s with 27.5 inch tires.

Hope you guys can give me a tune with this info thanks in advanced.

It's not that easy, what came in the carb? How are your plugs burning??? Probably startoff between 70-74???

The carb when I got it came off a late model the jets now are 75 and 80s. It has four corner adjustment for the idle mixture. As for plugs I never thought of pulling a plug but I could and tell you what it looks like. Thanks for the reply

this is what the plug looked like when i ran it with the 75 and 80s. its got a 6.5 powervalve in the front and blocked in the rear. i was thinking of adding 83s to the rear cuz i think its going lean when the secondaries open up. also it has a slight hesitation so i was thinking of maybe putting in a 9.5 powervalve if it would help. also if i dont run atleast 1.5 turns out on the idle mixtures she stumbles really bad so i was thinking of adding bigger squirters. let me no if it would help thanks

How about a couple of different plug shots hard to tell from just thst one....