Those exhaust manifolds look very similar to the ones on my 1986 Chevy K20 truck, the difference is mine have the smog pump lines going to each cylinder. My truck is not original, it is an 1986 K20 frame and drive line (originally had a 350 with a carb) that has an 1987 R20 engine (TBI 454) transplanted in.
K20= 3/4 ton 4wd
R20= 3/4 ton 2wd
I would think you could go to your local auto parts store, or look online, and compare parts for a 1987 454 aka 7.4L engine to see if that is closer to what you need. One thing to note in 1987 the 454 could either have a carb or be TBI (throttle body injection), this may make a difference in some parts applications. You will definitely want the heat shields for the spark plugs/wires or they will get damaged from heat. I purchased mine through the local GM dealer, couldn't find any other source and they had to be ordered in an odd quantity. This was probably 15 years ago. I might still able to dig around and see if I could locate the part number, I might have one or two still in the package. Been so long I can't remember exactly how that project went down.
It would be interesting to see what the casting codes are on your engine, from the pad on the right front or the engine below the alternator and from the bell housing on the back of the block. Knowing what the original application was would help answer the questions you have.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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