proud new owner of....

an 87 CRX SI....I saw it advertised locally for $850/obo....i'll need a car for school coming up this fall. I ended getting it for $550. I missed registering it by 3 minutes this afternoon. I was surprised to see it didn't come with a factory installed radio. I was telling myself I wasn't going to put money into a $550 car. I also didn't know that engines like the B16 B18's are able to be put into. It has 175K miles on it so that may be a possibility. I'd really have to do some research....not as supported as a 88-91....but couldn't pass it up