Semperboy

hi guys,
I was meant to pick my engine up from the engine builder today and he rang me up saying he had a bit of an issue, when we first discussed the spec of what to go for he suggested i used a blacktop head with the silver top bottom end that i dropped off! well the engine is fully built now and he went to put the cam belt on and time it all up and realised the issue of the tensioners being different! great so now i need suggestions as its really not ideal to now machine the head to move the tensioner or machine the block to fit the blacktop water pump!
please help guys ha thanks!

Semperboy

don't worry guys I've decided to machine up a plate to replace the water pump housing and use a electric water pump