Hi. I've done 18R-G to XT130. Pretty straightforward conversion. Depends on what version of the 18R-G you've got but even the a low comp EFI motor (which I have) is heaps better than the starfire. Early carby ones will go even better and make it an even simpler conversion. It won't be a rocket ship. It won't even be as quick as an RA28 with an 18RG because an XT130 is heavier, however it will change the character of the car significantly.
Parts required for a carby 18R-G conversion -
RT132 engine mount brackets (or fab your own, actually even celica ones should be close)
RT132 or RT104 W-50 gearbox, gearbox crossmember
RT132 tailshaft will fit, RT104 might.
Have the outlets on your radiator moved
Sort out your throttle cable, heater pipes, radiator hoses, exhaust (all the plumbing),
Pretty textbook really.
If you want to have a look at how to snowball it into a 3 year project have a read of my build thread. Almost every xT13x related question you could ever ask has been answered in there. http://www.toymods.org.au/forums/showthread.php?t=56010
Drop me a PM if you have any more questions, these aren't a particularly popular model so i'm happy help.
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