Big block valve cover blocks heater blower motor

Just installed my 383 big block into my 1974 Plymouth Duster and I noticed that the TrickFlow Valve covers are blocking part of the hole for the non A/C Blower motor. I installed the TrickFlow Valve covers over the TrickFlow 240 heads with Harlan Sharp rockers. Does anybody have a solution without using different valve covers? Maybe a mini fan motor? Perhaps there are valve covers which are smaller but will still fit over the Harland Sharp rockers and not block the Blower motor. the blower motor I have is the OEM type which is pretty large (3" diameter) and sticks into the engine compartment 3".