A couple of thnings,, first those pictures of the regulator mounted on the firewall,, TABOOO, Bad, No No NO!!!
NHRA tech says specifically the the regulator and all connections must be mounted 6" forward of the bellhousing / flywheel. No if, ans, or butts
Also an accumilitive MAXIMUM of 12" of rubber line in the entire fuel system, from tank to carb.
If your never going to the track, this means nothing. HOWEVER... rules are made because someone was hurt or killed. Good enough reason for me to not mount the regulator on the firewall.
And just a quick mention about the spacer,,, A 2" spacer like that is 'properly' used to raise the effective rpm range of the motor. (likewise hurting LOWER RPM torque)