r33rb25det1993

Rta paper work states it's a 2000 rb25det and from what I know a single igniter at the rear of the motor means s1 rb25 also a comp test showed between 120psi - 155psi .... The motor now has a slight knock so it is almost pulled out and a second hand rb25det is going in

Hello, I have a 93 r33 with a 2000 rb25det and I think it has a older s1 head, it has the single ignitor up the back of the motor, any one know if this set up affects the compression ratio? Also it is blowing white/ blue smoke all the time and a bit of black at higher rpm, no oil in the coolant and not water in the oil. It has a front mount electronic boost controller and a 3in cat back system and I don't think it has had a tune. Also before I got it, it was ran with no water and the head was replaced with the older s1 head. Should I replace turbo seals and or valve stem seals?