I ran my inline with the heater, just come off the head to the riser, then from the riser over to the heater fittings on the firewall. Requires some new heater hose, but you pretty much retain the stock routing. I'm sure I came out and around the manifold to get away from the header.
1996 T100, Stock, 207,000 miles
1973 FJ-40, Stock, getting an H41
1984 FJ-60, Stock, 225,000
1997 FZJ-80 Stock 126,000 miles, now for the wifey
2002 Subaru Forester L, for the wifey