65 Valiant small block with Heddman fenderwell headers. Need suggestions on master cylinder upgrade

If that was mine;
I would convert to a dual master, on an old Bendex dual-diaphragm booster, with the vertical offset bracketry. This will raise the M/C and push the lines quite a bit forward, away from the headers; But I would still reroute my lines away from the headers, Making lines is not hard .
In an A-body, you may not need the booster, so check around on FABO, mabe somedody has just the offset business.

Here's the kind of thing, I'm talking about

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