1.88 intake valves

Hi from Down under
Can someone point me in the right direction to buy some 1.88 intakes for a 675 318 head for a fair price ?
cheers
Summit, milodon,manley, or just get a set of lower priced 1.94/1.60 11/32 stem valves and cut them to 1.88 /1.55 and port the **** out of them. What's the plan with the heads?