I believe you said it took around an hour or so before your power loss
starts. IMO this will almost certainly be something electrical. I recently
had this with my P4 Rover which has a double fuel pump and a single SU HD8
Carb. I did everything one could think of to clean the fuel system but after
40-50 miles the engine would start to miss if you tried to open the throttle
more than 15-20%,
I changed the coil, distributor cap, HT leads, rotor arm, condenser and
points all at the same time as I was on a serious drive, so can't say for
sure what component was faulty, but the problem completely disappeared.
Also had a similar problem with the 4A not long ago if the engine was at low
revs and more than eighth throttle. Turned out to be a very dodgy contact
between the HT wire and the top of the coil.
HTH,
David Brister
1967 TR4A
1963 Rover P4 110.
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