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I will use that general thickness when i grind and shape the built up arm.I will start a littel thicker do some testing and go from there. i have most everything set up and ready to go. wire brushed the arm last night to clean it up. i am also going to see IF their is any of the free play in the arm when on the low side of the lobe. figure the arm should be under tension during all motion. seems that IF the arm is not then there is wasted movement where the diaphragm is NOT moving or doing its job.

had some time tonight to work on the welded up fuel pump arm.
wire brushed it and cleaned it up and then set up my bench grinder and away we went.
too my time to try and keep the stock looking profile. after grinding ended up with a thickness of approx .390

rebuilt the fuel pump, oh yeah while waiting for the welding i did glass bead the fuel pump and my spare one. 
so it does look nicer now rebuilt it following TFS instructions, and tips from here

went together nicely. drop of oil on each wafer, also a drop of oil around the gasket to help it seal along with glass bowl, a little dab of grease on each pin on the arm inside.

on the bench i was able to get approx 7-8 Hg on inlet and it holds it on output get around 1.5-2.0 PSI

that is full stroke by hand

i installed it on the car with a new gasket and made sure the lobe was low side to pump, high side away. in doing so there was about a 1/4" gap between block and pump mount once the arm hit the cam, then pressed in and tighten down evenly. this is what i was shooting for that way the 1/4" of fere play is null once installed. 

ran a test, and was able to get about 6-7Hg on suction side with about 10 seconds of turning over motor, no plugs installed, and about 1.5-2.0 PSI on the outlet.

shot a short video of just a few seconds of turning over, but it does build of vacuum quickly.

Fuel Pump Vacuum Test

that is all i had time for, have to clean up yard, and all loose items, bring trash cans into garage, etc... preparing for Dorian heading this way !! also had to prep my sump pump to keep water out of my garage, they are calling for 5-6 inches of rain !! so everything off the floor !!

was recommended to me to make sure i clean up and polish the fuel pump arm to prevent premature lobe wear. having the ground surface of arm vs mooth ground surface of the cam lobe.

if so I plan to pull the pump then polish up the arm surface area

decided to see if the fuel pump would prime.  

hooked up the tank line to the pump inlet, then the carburetor line to the outlet.

pumped for 10 seconds... nothing
1 of 3

another 10 seconds and fuel starts filling bowl
2 of 3

another 10 seconds bowl is full
3 of 3

so have to say pump is officially pumping   tomorrow plan to see if we can prime the carb (get fuel to it) then see if it will start & run, or at least try to.