What design of Motor mounts does he want to use Yoshi?
Do to your being in the UK (yes folks YOshi lives in the United Kingdoom and shipping costs a big chunk) Fabricating some mounts and locally available rubber biscuits (think Hockey puck with a hole in the middle) and get out with the cost of the metal and rubber pieces.
If you study this a bit you see that it has a triangular shaped plate that bolts to the side of the block and a leg that comes out from that that sets on a pad fastened to the inside of the frame rail. This would not be real hard to make and the cost would be real low.
http://www.ebay.com/itm/Transdapt-47...hVV6SR&vxp=mtr
Another option would be a tube crossmember that uses factory style 68/64 Chevy motor mounts. Those are real simple to use and not too expensive.