I have what was told to me when I boat my airboat a few years ago, That its a stock 1992 chevy 350 vortec motor. That was converted from fuel injected to carb. It has an edelbrock aluminum intake and holley 2 barrel carb. The # that i found are on the drivers side back of the head on the lip where the trans would bolt to. 10054727 5.7 lg. Is that all the numbers that I need to see if its truly a 1992. I'll tell you why I'm trying to find out the year. My airboat has been loosing rpm. I use to spin 2950 rpm and now I spin 2300 rpm. So I just took a compression check. Its not good. Im no machanic. This was my readings standing at back of motor ( were prop is). on the left side from front of motor back 80psi 94psi 85psi 140psi. now right side of motor from front to back. 138psi 100psi 150psi 135psi. I'm not sure if it rings, valaves, or head gasket. When I first start it up, it does puff out some little light blue smoke then clears up. Any help would be good.