CRX-ZC advice please

Hey guys! I'm fairly new to the board, but, I have an '89 CRX-Si that's gettin up there in the miles. I have a friend that can hook me up w/a ZC engine imported from Japan for only $450 plus whatever shipping is.
I was wondering if any of you have done this or seen this done. I've heard things come up about the brown seals vs. the black ones, & I know the black ones are better.
What I'm wondering is: Is it gonna be really hard to find little piddly parts that I might need like spark plugs or oil filters or little things like this.
I would probably go w/a bigger motor...maybe up to B16A, but I'm a spoiled brat and MUST have my A/C.
Help me out guys!!!
Thanx in advice.