Best way to do this would be to stick a set of carbs on it, cam and a new set of lifters and get it all set up properly.

Theres no way your 16i will be doing 115bhp at the mo anyway.

For more hard work RST engine with all ancilaries and wiring harness and exhaust will do the 150bhp easier- just stick it on your box though or get a S1 box as the mountings are different.

Brakes wise- you need to do something with the tie bar and bulkhead flex before you attempt to make the brakes work. (RS16i problems)