They sell oem king brand bearings on ebay at a good price. They also sell oem pistons ,some us at a great price.

Not knowing what year yours is some even 100k motors show little bore wear and could get by with a hone.

With oem pistons at around $125 a set with rings id consider new unworn pistons.

Also on enay are some good cam kits and cam, lifters, springs and chain all made by elgin.

Same thing for oil pumps if you take a few to look on ebay there is alot of good cheap 318 junk from the gov dumping all the mopar junk used in the military and oem good oil pumps are priced well below mosts.

So I dont see it being very hard to freshen up a teener with good parts without killing your wallet.