are you talking about the Crx HF motor which is the 1.5 8 valve D15b6??, you cant use the stock block without swapping pistons cause there is no valve relief for the other 8 valves , when you put the 16 valve head on , I would try Hondamotorsonline or Osaka you can get a SOHC vtec motor shipped for under $900 with tranny to your door what chassis are you using?