Im pretty sure its behind the timing cover, i can hear it pretty good behind there both above the engine while its hot and while its on a lift, i might need to check those guide bolts, perhaps 1 worked loose. i agree completly, more time, more money and more attention to detail would have paid dividends here, sometimes u have to work with what u got, espesially when its your only vehicle. i port matched my heads, had the centers welded and i ground the runners down, had them sent out to be smoothed. Any transmission tricks i should know about while im getting ready to put my trany together, im looking for a tbd, but having trouble fronting the cash nessary for a unit.