the high pressure on #1 can be caused by a colaplsed lifter in the intake, or (worst case) missing lobe, causing early closure of the intake valve. Or if your're lucky could just be that lifter is not pumped up all the way. at this point you may want to pull the driver side valve cover and start it to make sure that pushrod is spinning
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports,
3" pypes, Hooker 1 3/4" headers, hydraulic roller,
10" Continental, 3.42 gears
11.5 @117.5mph 3900lbs 
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