92 tbi 350 rebuild or repower ?

[rickpilgrim]

The 92 truck has low oil psi when at operating temp. Even with the new sealed power oil pump and 10w-30 the highest is 28-30 psi and 10psi at idle. Under full throttle when you get past 3500rpm you can hear a faint rattle. That and a quart of oil every 250-300 mi. It starts and runs awesome and has decent power with no check engine light though.
Now I have an unknown 95 K2500 350 that was supposed to run good 2 owners ago, could rebuild that long block, but can I cam it without tbi/ ign mods?
I also have a good 98 5.7 4 bolt main vortec that runs nice and has awesome oil
Pressure on 5w-30, can I make a tbi vortec engine?
Thoughts anyone?