I have a free gps speedometer app on my phone , I just compare it to the speedometer indicated speed and adjust drivin gear tooth count up or down depending on amount of error , keep in mind you can only go so far without needing a speed reducer and some combos tend to have shorter driven gear life

I have a st of leMans rods with C&A cap screws any idea of torque numbers

you did leave out the factory spacer between the cam and gear , all aftermarket units come as it being part of the gear , that spacer is around .277 thick

What are you hooking it to ? The polarity is critical

https://www.enginelabs.com/engine-tech/engine/inside-the-new-edelbrock-vrs-4150-four-circuit-carburetor/

Just wanted to add to this post that at the drivers meeting for The Track ( BSD has been my home track and ive been there every year since May 1971 ) I asked  Mike if he would have any shower facilities on site and he said that he WILL have some at least two stalls , so good news for campers

What lines are ok , can you run an aluminum cell , maintenance and carb mods needed

If your combo kicks back you have a weak starter a weak battery bad cables / bad connections , or a combination of those , an FE ( other than the early pre 65 engines ) have a 184 tooth flywheel / flexplate lots of mechanical advantage ,and  although I never recomend it many racers use locked out timing , so they are starting with up lots more than 14 , as posted find true TDC on the balancer and be sure you weights arent sticking in the Dist , I never recomend under 2600 all in on a pump gas combo , pump does NOT like that fast of an advance and the springs used are so light that they may not pull back the advance weights if the dist isnt in perfect shape , most factory cast heads end up with totals in the 38-42 range , modern aluminum in the 32-36 range WITH THE CORRECT FUEL , If your trying to run highest possible hp numbers with pump, your playing with fire , err on the side of caution and be conservitive with your totals , BUT you MUST know your true settings finding TRUE TDC is the start or your chasing your tail and guessing wont end well