hey, i put a 4ge into my kp61.
This is what i did...
FUEL, brazed a new bigger pickup beside the factory fuel pickup ontop of the tank, easy as. (For all the new solid fuel pipe under the car i used 3/8 bundy tube, from BNT $25). Used a fuel pump from a RB30 turbo Skyline, being an in-line type it's easier to mount. Up front, i got some high pressuse fuel hose from Hydraulink (300psi), and got them to braze a push-type fitting onto the O.E. banjo joint that bolts to the fuel rail (all up about $30). Got a high-pressure fuel filter from Rapeco... done and done. Didn't bother with a surge tank as its not going to be a race car, i just have to keep it above 1/4 tank full. The factory pickup is acting as the fuel return line.
With the g'box, i used a K50 out of a 3A power RWD Corolla, (bolts straight to the 4age block) this saved to having to make ANY trans tunnel mods, all i did was swap my starlet K50 tailshaft housing over to the corlla one, so the x-member mount and shifter hole sit in the same spot as orginal, output shaft spline is the same, allowing you to use
factory UN-modded driveshaft. For the clutch, i used a 200mm dia. flywheel, standard 4age pressure plte, but i had to get a disc made up, (about $150, pain in the butt, but i needed it) to suit the diameter of the flywheel, and spline count and size of the input shaft on the g'box.
If u wanna know nything else, let me know