Best starting point for V8 swap

The engine I just put in my Signet is a stock 91 Dodge 360 roller. I bought the complete excellent running truck with 48,000 miles for 800 bucks which was a former city truck here where I live. It has the electric fuel pump and so did my car so that wasn't a problem and an easy swap if I didn't have one but I did put an Edelbrock carburetor on an older 360 manifold with all its gauge thingies. The transmission that came with the truck is a 518 and in perfect shape but am using the 727 which was against the 340 and already in there, however I did change to a B&M flexplate and the fenderwell headers which were always on the Signet, here's a photo.
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This is all the stuff I already had on the Signet so all it needed was a hook up. I could have used the stock radiator if it had one and figured out which exhaust manifolds by asking here on FABO which was very helpful in making this simple swap as well

BTW, with the 6 cylinder I would change over to a 70's V8 Duster K-frame with the disc brakes as I did but my Signet already was a V8 car but wanted better stopping power and that setup offered what was needed at a very reasonable price and conversion