Hello everyone, I'm looking for some advice on overhauling a 302 in my 1959 GMC 370,
It is a dump truck and I use it for this purpose (heavy hauling). I would know where to find parts, and what parts to use.
Thank you

I meant I would like to know what parts to use and where to find them.
Thank you

Not sure specifically for the 302, however my local machine shop was able to get anything/everything i needed for my Chevy 292. Are you working with a local shop for machine work or anything?

You are using it for what it was designed to do so not a lot of expensive racing mods are needed. Likewise expensive hard to find speed equipment isn't needed. All of the stock components are plenty rugged for a truck engine. You may have to search the internet some but most parts are obtainable. Check with older machine shops and parts houses in your area. When I worked at CarQuest 20 years ago their computer system could search the inventory of every CQ store in the country, if you can find someone to search. O'reilly has a way for the counter person to get help from the home office in Missouri for hard to find parts. Best Gaskets makes a great new set of gaskets.

Ellis made 2x1 carb manifolds for all kinds of inline truck engines and they show up on eBay often. Duel carbs, long headers, more compression. and possibly a special low RPM cam, but the stock cam is fine for you. Possibly custom pistons? Quite a bit can be milled from both the head and block to raise compression.Just remember to be honest with yourself about what you want your truck to do. It can not haul 10 yards of wet dirt and do the 1/4 mile in 12 seconds.