ReBuild Engine or Buy

I'm thinking of rebuilding my my non vtec motor(dont know the name for the 1.8L) or replacing with a b20 type R engine. I'm having trouble deiciding. If I rebuild the engine what components should I use?
Also does any one know where I can get Mugen parts(somewhere with a good rep)?
P.S.- I have a 1990 Integra 4 Door

b20 type r motor?

u mean b20 block/b16 head?

the motor number for a integra type-R is b18c5 try is site for mugen parts


www.mugen-power.com