I have a hydrolocked B18a1 with a performance clutch and flywheel, anyone know if the clutch and flywheel (or complete tranny) will bolt onto a b18c1?

yes

yuppers, however if you are going throught the trouble of swapping a new engine in there I recomend putting in a new friction disc at the very least if not new clutch kit entirely. Wouldn't want to have to pull the engine or tranny back out in a month or two to do a clutch job ya know.

Yeah, i thought about that after i said it and i think i'll just pull the clutch and flywheel and stick with the tranny that's in the gsr