I had my Barton manifold powder coated a while back just b/c I hated the way it looked. Had it done in a color so it would hopefully look brand new for a long time. I think it turned out great. Can't really comment on heat issues, haven't really noticed any difference.
coated...
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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