r series to an a series

[treeninja]

hey i got a 3rd gen gts im looking at some motors now how closely does the r series come to the a series motors my 3rd gen looks super close to an86 corrola are they on the sme frames or completly diff cars does anyone know of any motor swap walkthrougs/guides as for swapping out the 22r for somthing bigger like a 4 age or 3s ive looked no one can give me a straight answer as to weather theyll come close to fitting or not i got all these people telling me to do reserch i just cant find anything on a 4ag swap to replace that 22r any help would be awsome thnx