First off, the cost of over 4k to do that is friggin nuts. I am still waiting on back ordered parts, and then sending my motor in to get built. Im in northern IL and have a good machine shop. The head getting surfaced to an RA of atleast 12 or better, a mild port job, 3 angle valve job, new valve guides, and them disassembling my head and reassembling the head with new 264 cams and springs/retainers and shims is going to run about 800 bux for everything. Then im getting my crank balanced and having them assemble the block with new rods, pistons, and rings. Eagle rods, probe pistons, and moly rings. Im going to spend about 1500-2000 in labor, and this is a performance build. ARP studs, and HKS MHG. If your going to run only 12psi, you could get away with a stock HG set for your car with ARP studs.
http://www.nopionline.com/nopistore...id=1&vTitle=1989%20TOYOTA Supra&vn=0&vt=0 This is nopi online, and they have tons of parts for the supra. That is for my 89 turbo car. You can get some things for a little less at drift motion, and horse power freaks, but nopi pretty much has it all. Im guessing you are wanting 12 psi on the stock CT-26 turbo. Here is my suggestions.
ARP studs (head and main)
Stock HG, or 1.2mm MHG
New bearings (you never know how bad the ones u have are and they are like 100 bux)
A valve job
New valve guides and seals
a manual boost controller (or electronic pick your poision)
A good boost gauge ( stock one only goes to 8psi)
Wide band o2 sensor (aem uego would be a good option for o2 and adjustability)
Full engine gasket set ( its 180 bux, and worth replacing what you can and know its good)
Oil pump (old ones kinda blow, shim the pressure relief to increase oil pressure)