B16A intake manifolds can be adapted to JDM "goldtop" Accord version B20A and USDM A20A engines... check into it, you may be able to adapt the B16A manifold to a US Prelude version B20A. Many things are different between the goldtop B20A and the 'lude version, but the manifold bolt pattern may be the same.
With the pk2 b20a you have to worry about the lean on the motor. You can make a gsr manifold pretty easy, but the runner are to long. So you'll endup running into the rear cross member if you not careful.