CA18det Throttle body.

[AustinHarbour601]

I have a quick question. I have a s13 with a ca18det swap, i just recently replaced the entire hot side:
GTIR t28, Tubular manifold, 3in elbow, 3in downpipe, manual boost controller set on 14psi with a Harshom Developments tune. i also have a FMIC, HKS bov, little heres and theres. well on my passenger side valve cover i lower rear theres a crank case ventilation hose that was leaking horribly, easiest way to replace it was to take the remove the manifold, i already had a sheet metal manifold and cometic gasket i wanted to replace it with anyways. heres where my problem is. The original builder of the manifold built it for a Q45 TB, im thinking this may be too large and i need inputs.