360 Magnum winter project!
My thoughts....
- If it was a great running 5.9 and lower mileage, replacing rings and bearings/oil pump is not necessary. Only if it makes you feel good. You can verify oil pressure on the garage floor.
- not a lot of difference in 1.5 rockers vs 1.6 rockers. Doubt anything you could ever notice by seat of your pants.
- On Drag truck's cam... the contrary is you may get more performance with that cam with better heads. I would match the cam with the converter for best performance. If you found a '89 LA cam, that should have a fuel pump snout and be roller. A place like Oregon cam grinders could get you what you want for probably cheaper than off the shelf being roller. Also, I got little longer push rods for the regrind for cheap cheap. I posted all the numbers in the one video