From what I've read, the budget is more than a Strict Budget, sounds like it has to run off of pennies.... --- and working with a '91 - LA with roller cam and 308 heads.
- Roller cam should have the snout for a mechanical fuel pump, and timing cover should have the block-off plate. My '89 did. Just use that cam, leave it in there, buy a mechanical fuel pump - 22 bucks.
- It will have a TBI intake you'll need to replace. Get a factory cast intake, and the later years with EGR valve are cheap, like 20-30 bucks. you'll need a 18 dollar intake gasket set.
- Swap oil pan/pickup tube. Can very in price, but should not spend more than 75 bucks total. then you'll need a 17 dollar pan gasket.
- Timing chain will already be a double roller, just use it.
Your at the bare minimum of about 160 bucks (unless you have a friend to donate the intake, pan&pick up tube), and you'll need a carb.