I have 00 greddy 18g turbo gsr. Im running 8ilbs on stock block. Im having minor problems like overheating this extremely hot cali weather. I have fluidyne full core with 2 slim fans. I have minor oil leak. Im done. Im going to buy a gsr block and upgrade to the following

Cp pistons 9:0:1 cp
Eagle rods
Maybe sleeve block 81.4mm
Cometic head gasket/Arp head bolt studs
Acl set of bearings
Im gonna run stock gsr head stock cams/gears. Is that fine for boosting 12ilbs on 18g gsr?
Anything else im missing? How much am i looking parts plus labor?

My goal is 300whp.
Im tuned with crome pro obd1 p28 chipped ecu now. Its running kinda rich. Im thinking of getting retuned . Since im running crappy prolite platinum plugs. I will upgrade to ngk 7's . My idle dies sometimes when its hell hot outside in Killa Cali.