Holley makes an adapter plate to go form square bore intake to TBI base. the biggest hangup is the ditributor, i am waiting on word from Lamar Waldon Automotive, they supposedly make a spacer kit to make the standard chey distributor fit in 348-409's. if not i will contunue with plan A which will involve some machine work to let the 348 dist accept the shaft and guts from the small block dist.