I have an 85 K-10 that I bought in Oct last year. I got it for a good price knowing it would need work. So far I have rebuilt the 700r4 did a lot of re-wiring of the hack job plow lite wiring that was there. It has a 305. Here is the prob. Now it is making noise. Sounds like wrist pin noise at idle. I have good oil pressure though. Here is what I plan to do. I have a 79 k-5 rustbucket with a good 350 in it with a holley 600 and E-bock intake. I plan on swapping this motor out to the k-10. Less than 5k miles ago I put a pre-emission cam in the K-5 blazer. The edlebrock performer cam that was in there wiped a lobe out in #6 Intake. When I swapped the cam I did not take the oil pan completly off which I should have to put a fresh gasket on and clean the contamination in the pan from the wiped out cam. So I think I am going to pull the 350 out of the K-5 and put a new pan gasket on it and maybe a bew oil pump and pickup. I also have a set of fresh 305 heads in my Dad's garage. They have been there for years and have not been bolted on anything since they came back from the machine shop years ago. These 305 heads are off of a 77 Firebird with a 305 Chevy in it. I also just one a set of headers on E-bay for 40.00 and just ordered the dual header exh. kit from Summit. The heads that are now on the 350 have some miles on them. Would it be adviseable to put the 305 heads on the 350. My buddy also has a comp cam 268 laying around that he never used and said he would give it to me. I already have tons of gaskets(all chevy guys have sets of gaskets they collect over the years..haha) and all I need are set of lifters. Any opinions would be appreciated. I figure it this way while I have the 350 out do all I can to it for what I can afford. I also have a 350 4bolt in my garage and I am acquirng parts for it. I am going to make it a 383. I already have the crank and misc. stuff but right now I do not have the time nor money to build that right away. Also the 79 K-5 has a fresh TH-350 and a good NP-205 in it. Thanks for your help. T.J.