yes off course you are 200% right bro, RX and GTO are still kings of the roads not only in Pakistan rather all over the world, still none of the pakistani present bikes can come close to these pocket rockets, we are proud on these super road bikes,
bro you have nice clean bike, dont worry about that, just put original block in it when ever you found it,
the availabilities of original parts are not a big deal if you have good contacts with RX freaks or junk shop owners then it would be very easy to pick the require part but one should be very keen and informative, i will must tell yu if i have any news regarding available parts, recently i think not more then one month ago my friend bought original block in 0.50 size with piston from bilal ganj and he also bought original exhaust from there, so if you are interested to keep it in original condition then you should be active, thanks