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T140 exhaust cam isn't the best choice.A 3134 cam from a late 650 ('70 onward) is a better choice and has about 10 degrees more duration and 0.009" more cam lift.

Watcha going to do about the breather holes in the intake cam?Are you going to drill the T140 intake cam?The nitriding is fairly hard for about 0.020" depth.You could get through that with a carbide drill.
Time the intake cam to 100 degrees ATDC lobe centre +/- 2 degrees.Take measurements at about 0.080" lift to find the lobe centre.
 
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