I have the 'speed daddy' dual outlet ebay ones installed on my 170 in the '62 i had to due some enlarging of the mounting bolt holes to make it fit correctly but it wasnt much after that install was a snap didnt have any issues and still dont they sound pretty great if you ask me, they are a tight fit i did install them from the top much easier to do with out the head on and then put them in and install the head but can be done with head on or underneath but i didnt have the room for that so from the top they went, i will say that some of the bolts are hard to get to, and the pass side shock tower may get scratched during install and will be only about 1/2" from one of the header tubes but other than that with the high starter motors like ours they fit fine theres a decent amount of clearence around the stater itself, about 3/4 from what i could tell and they even cleared the orginal generator so i would say go for it!