Alright so another update...sort of.

Pulled valve covers and here's what I found:
Good amount of rust on right bank(2-4-6-8). Most around the eight region(cylinder with lowest compression).
Heads had the following info stamped in different places: Merlin / W / NH / 92 / L23 / 1-043
Does have roller rockers(bronze in color, no name I could find).
The pushrod guides have comp cams 4806 stamped on them.
I could see below the intake though the head. There is not roller lifters, so hopefully no roller cam.

I couldn't really perform the leakdown, my generator only got the air compressor to 25 PSI. Then the circuit breaker would blow. I tried it numerous times, but kept doing the same thing. Obviously there isn't electric close to the boat. I went ahead and put 25 into the #1 since I had the tester screw in and #1 TDC. It took the 25 PSI slowly leaked down, but I couldn't feel or hear it coming out anywhere.

I wanted to get pics, but I sat my phone down on a wet surface. The phones camera lens fogged and the pics were bad.

I figure something out on the generator and get back to it tomorrow hopefully.