As the ST141, RT142, RA60, have the same chassis go with the ST as you will only be upgrading it any way...
As for parts :-
RA60/5 front brakes.
RA60 "T" diff' inc. tail shaft & sway bar as 60's is biger than the 141/2's.
RT142's rear disc's.
RA65 or RT142 EFI fuel tank.
SA63 gear box.
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