Third times a charm. I was surprised to see the spar cap arrived a day early. Went ahead with cutting the ends, clamped and match drilled all of the #30 holes through the spar web.
Took an extra step to make sure I was making a top or bottom cap, as I recalled the holes are different. Confirmed this is the bottom spar. Still need to drill the #40s through the flange but a little concerned about running a bit through the already countersink spar flanges. I may use the old, ruined spar to drill these holes. I need to make everything aligns. Will tackle that tomorrow.
5/13: got back out tonight and got the #40s drilled through the flange. Used the old spar to preserve the countersink in the new one. Worked well. Drilled the #12s too. Ready for priming.