I also did this job recently except it was both the intake and exhaust which I did not seperate. Be sure to put everything in loose and make sure the dowel pins engage in the manifold befor tieghtening everything up. Mine was a real tight fit on the outer holes and had to be aligned very well to engage on the pins.
I like the brass nuts idea, think I will change mine over.
THING 1 - 1973 88 SIII - SOLD
THING 2 -1974 88 SIII Daily Driver - SOLD
THING 3 - 1969 88 SIIA Bugeye Project
THING 4 - 1971 109 SIIA ExMod - SOLD
THING 5 - 1958 109 PU
THING 6 - 1954 86" HT