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I ended up putting my roller cam and EQ heads on an LA block. I ended up with 224/230 on 110 LSA (Wanted 108 LSA). I wanted a street friendly grind and even with the small chamber EQ heads and thin head gasket I only netted 8.7:1 compression ratio. If you can get closer to 9.5:1 compression...

If it is a dual plane M1 it will look like this: If it looks like that, then either someone swapped it or you have the 300/320HP version. Early ones were rated 300 HP and later ones were rated 320HP. I am pretty sure if it have the LA cover on the fron then it will have the fuel pump...

If the lifter is collapsing it would get worse. Do you have an oil pressure gauge in the car? if you do watch the gauge and listen to the lifter as you slowly rev it up. Does the sound vary with the displayed oil pressure?

If you want to go roller cam, then the magnum block would be a better place to start. If you can verify the magnum runs and doesn't make any strange sounds, then it would be a good starting point. I started down this road a while back, but the Magnum I started with for $400 turned out to be...

Just some food for thought. 1) the EQ Monster Magnums are the exact same castings as the EQ Magnums. The only difference is the springs/restainers. Clearwater sells a version with 2.02 intake valve for $375. If you call them up they will install springs to match your cam specs. If you have...