there are alot of good write ups on here for swapping in motors.. in the search bar just type in something like 1.6 upgrade or look through the build section... if you can't find anything, I can find one my buddy did and post up the link... bigger radiator is not needed, no the motor mounts from a 1.3 won't work, the 1.6 sits higher if i'm not mistaken, there alot of good places to look for swap kits.... I like the petroworks, it's a nicer kit imho... but ppl go different ways due to money or preferance... good luck on the search, and keep us updated...
BTW, welcome to the site.... it's alot of fun here, and ALOT of good info...