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where would I get a catalog of performance parts for the 300? I heard there was a 6-pack carb and intake set up for the dodge slant six, in the 70's or 80's. Is there such a thing for the Ford inlines?
If you don't mind being raped you can get them at www.cliffordperformance.com . If you prefer to pay prices closer to normal all the major mail order places (Summit, Jegs, PAW, etc.) carry the parts, they just aren't in the catalogs because of the low volume.
Call them. Summit and Jegs both have pretty knowledgable people on their phones, and they can always look things up. Anything you can do to another motor you can do to the 300 (besides aluminum head with water jackets). Intakes, carbs, headers, valves, cams, etc. Some things like the tripple deuces are a hack-your-own kind of thing or a get-raped-by-clifford kind of thing. Clifford also has a dual quad intake (or dual deuces with the 2bbl plate). Otherwise it's finding a used Edelbrock or Offy multi-carb setup, an old Holman Moody 4bbl, or a single or dual plane offenhauser intake, both of which are easy to get. Cams are everywhere. They offer roller rockers, etc.
Makers of Camshafts:
Clifford Performance
Crower
Crane
Comp Cams
Lazer Cams
Accelerated Motion
ultraDyne
Blueracer (owned by crane, but different grinds)
Schneider Cams
Iskanderian
Header:
Clifford Performance
MAC
Dynomax
Pace Setter
Hedman
Hooker
You can get an aluminum head, but it won't be bolt on. I found a set of TFS Street Heat heads at a swap meet last year (which I didn't buy) for $250. They had been mildly ported and were complete with stainless steel valves. If you can come up with a similar deal, cut one cylinder from each end and weld the two together so that there are 6 in a row. This will bolt right on and work on a 300. You would have to get crafty with intake and exhaust, but it really shouldn't be that difficult to adapt an existing intake and headers to fit since the port spacing is the same. It would probably be easiest to just make an adaptor plate out of some aluminum bar stock. BTW, I was quoted $150 for the cut and weld operation on the heads including resurfacing the deck. I thought that sounded about right. So for $400 I could have had a nice head, and probably less than $200 more some adaptor plates for existing manifolds. The adaptor plates could actually be made fairly easily at home if you had a die grinder, router, drill press, tap and die set, and maybe some other stuff.