In answer to my own question, an adapter from 4 bbl square bore to TBI is available from Holley, see http://www.holley.com/HiOctn/ProdLine/FuelInj/FIPA/1FIPAL2.html part number 17-45. This should be the one I need. I'll have to see how much it costs. Throttle kick down still a problem. HMMM. Roger