As for header clearance, I had a Duster with an RB runnuig Indy EZ heads, and TTI headers.
Pitman and idler arms did hit the headers @ full lock.
Rt side spark plugs were something of a chore, especially #6.
I didn't do the engine swap, but seems to me a low-deck would be a more friendly fit.
Photos are after I cleaned things up, in case a reference is needed.