I like ecklers classic Chevy for parts and they have books as well. The shop manual and user manual are very informative and worth having. The engine size however is difficult given you're not very good on the internet, the best way is to find the serial number stamped on the block behind the distributor and look it up on the Web. I have been told that if you have the original oil pan, a 235 will have 235 stamped on the side of the oil pan. Another great place for parts is NAPA, at least my local Napa is very informative and usually has what I need in stock. Great looking truck by the way, I have 51 4400.
