Hi I am using a 3 wheel trike. I have a 1965 Moter and Will hook it up to a VW trans. What is the best Carbs. 2 stock or putting 1 on? Also what nomber of a rev. Cam is the best to use? Also looking for 1 head. The one I got in #3856759. Can I use a 110 1964 Head to replace the one that is no good? What is the dif. Betwen the 1964 and the 1965 heads? Thankyou Jim