22R was never in a forklift, at least as an OEM install, it is possible that it was swapped in. would actually like to see pix of that.
5R engine was used till about 1984, then the 4Y was/is used to this day in Toyota forklifts.
If it is a 22R, you need to find out if it is early or late, early 22R has double row timing chain, slightly shorter block height and a different head, newer version ( including the 22RE ) have taller block, single row chain. parts won't interchange with out modifications.