Denso style alternator mounting on sbc

Mounting a denso style alternator on sbc s10 with manual steering. It has a proform electric water pump. With a 1/4 inch motor plate. Spacers are 2.875 and 3.375 the bolts are 3/8x5 and 3/8x5.5 and 5/16x1.5. I did put washers on out side of 3/8 bolts and 2 on the 5/16 bolt with lock nut.
The hole is 4.161 from lower mount
www.speedwaymotors.com/Low-Mo...
www.speedwaymotors.com/GM-Den...

[@johnnybrigham8754]

Hi dave have you made any test plates?? Look for one for 400 and do you mark all holes? Thx dave.

[@naudydave]

What do you mean by test plate. When I was seeing what was going to work I made about 10 different one out of 1/8inch to see where everything was going to be. I have a cnc plasma cutter and has to tweak the part in fusion 360 cad program.