cannot use d16a8 gearbox on your d16y4. input shaft in transmission has different spline size. search with these keywords for more info. (bennjamin, d16a8, transmission, gearbox) or something of similar words for more precise findings.

waste of time and money trying to locate y8 head & installation, will most likely need y8 ecu or similar.
y4 dont have vtak. you should get another a8 motor and save your money for something better.

yes im one of those ppl who think it's useless to work a d. hi hello how are you?