Two things...Did you eliminate 2 junction blocks and run longer lines? Don't know how you did that.
About 8 years ago I did the dual MC on my '54 3100 and had similar problem. Turns out the plunger rod from mounting kit was to long. Company sent wrong length by 3/4". After confirming with CPP, cut it down & rounded end on bench grinder. Problem solved. I did keep original junction blocks and New 3/16" & 1/4" lines.
Should be some free play in pedal ??? I did not have the Hucks so I may be all wet.
Did you do a search on brake problems ? I find answers all time.
Good Luck!
1954 44001954 3800Jim D. '41 Chevy 1-Ton Pickup/dump...292" 4-speed w/Ranger OD ... Newest Truck '54 Chevy 3800 Dump........New Truck! '54 Chevy 4400 flatbed/dump, Gone to my brother-in-law '13 GMC 1500 daily driver ... 5.3 6-speed auto just turned 13k miles '01 Chevy 2500hd, might be my new daily driver ... 6.0 / 4L80-E
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