forgot your ?s

yes I think that tail pipe will work out great but may need some trim work due to the shorter wheelbase of a RC chassis or custom pipe work.

I used all studs on my BB truck with a set of hedman 79250 headers

used cheap mrgasket gaskets with some permatex copper rtv on both sides. no leaks in 7 yrs so far.

but with a set dougs tri-Ys I vote remflex

also watch the machined edge/head casting with the header gasket.

I noticed the paper gasket I had used, the ends were notched to "hang" the gasket on the studs while installing but the machined ridge would catch the edge of gasket...when torqued it would put a crease in the gasket and would burn/fail/leak.

flipped it over and it fit flush for no leaks. test fit gasket to make sure gasket is flush on head surface as well as header flange.