D series

What do you guys think of this...I am thinking about buying a 88 crx DX with the d15 dual point from a friend of mine for an everday point a to point b car. The motor in it is back fireing out of the intake really bad, and i haven't had a chance to really look into it, but i am willing to bet that it has some valve problems. Anyhow, this is my question. My other friend has a d16 out of a 88 crx si. Is it possible for my to throw that motor in there and just put my intake on it so i won't have to convert to multi-point? I am pretty sure it is possible...but i just wanted to get some imput. thanks.