The bolts on a poly are over and under the exhaust ports. The TTI's, which I have, fit great but it is tough to tighten the middle header bolts especially. I bought a fist full of wrenches and torched them into various shapes so I could reach around and hopefully tighten the bolts. They supply reduced head bolts or it wouldn't work at all as the header tubes turn sharply down and allow only minimal room on the bottom side. It also requires the smallest mini-starter you can find. I installed a Versa shield blanket around the starter and had to install it like tooth floss! If the starter goes out I'll push start it :-) All this said I love 'em. I certainly wouldn't mind the Schumacher's either. I probably would use them instead on a milder engine. It'd make life easier. Rich Kinsley '64 Dodge Polara 4dr 318poly w/goodies ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.