53 years young

['65fleetSide]

I was gifted a 1965 Chevrolet C30 fleet side that hasn't ran since at least 1992. Everything is in acceptable shape considering the elements of being outside in CA weather. According to my Uncle he had did an engine swap with a 68 Camaro and went from a 230 to a 292. However, I read the number stamped on the block and it comes back to a 1970-72 250. If there is an easy way to confirm this it would be greatly appreciated. I am super stoked to bring it back to life and completely restore it back to its original beauty.
As of yesterday I installed a new Summit Racing Distributor and plug wires and she fired right up. (What a beautiful sound) There is oil in it and so although I don't know much about old cars I do no the basics of machines.

I am just here for any information on where to go from here as far as electrical, fuses, transmission fluids, engine oil, engine components, Ill take any advice I can get, thank you in advance and I look forward to sharing my restoration.