Here's my recent heater backdate completed. I've also upgraded the standard '78 SC headers/heater boxes with SSIs which appear to have more air volume around the headers and deliver serious heat up front.  I don't know what a heater backdate would be like with standard headers/heater boxes..
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'78 911 SC "Blackjack" & '76 914/4 2.0L "The Brat"
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'99 Honda VFR800Fi, '98 Honda SuperHawk
'88 Honda Hawk GT, '77 Honda CB750K Cafe
'69 Honda CL350
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