i've used regular washers on all the bolts holding the distributor housing on and haven't had any leaks
usually i put permatex stuff on there to seal, but i think rtv/silicone will work fine
just get all the bolts threaded in and the gasket situated nicely before torquing down
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1969 2002 Automatic w/ Sunroof "pumpkin"
1974 2002tii #2782677 (being assembled)