The 1.6 block is not very strong, going for 87mm is probably not a good idea. I think veri did this to a 1500 but needed 1100 rods. Tipo block is taller so it would be a whole new can of worms. 1500 is a better block but I dont have one:(

the 1.6 valves are bigger than UT so they would be better to use:)