Building a 273

273Dynamite said
Hi,
im building a 1969 273 with a 904 automatic trans for my 2 door 1949 Plymouth.
its a stock 2 barrel carb i believe 180-190 horsepower. Me and my uncle want to build it to the super commando specs ranking in at 275 horsepower but trying to push it up to 300 horsepower. I acquired a '65 Commando intake #2465726

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View attachment 1715959407 , Im not sure if that will fit on a '69 block. I know i could use the Edelbrock LD4B intake but would like to see if i can use the '65 commando intake. Also have a '64 8 3/4 rear end for the Plymouth, should bolt right in, its an inch bigger than original rear end. Just wanted to see anyone else's input on this build and get any other opinions and options for it. thanks!

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You probably have this info already but just in case I'll post them. When I inherited my uncles '65 Formula S I also got all his Hot Rod magazines (complete up to '74 or so) and a lot of white paper from MOPAR. Clearly he was going to drag race the car, obvious by all the paperwork he'd collected. every now and then I check in to read up on the 273 as I'm going to rebuild with the original 27, 000 mile engine or the '66 S engine that he had stashed in his barn. Always learn something here as I'm more into old Fords and Chevys.
By the way, somewhere in this paperwork I've seen the term Super Commando 273 used but can't find it right this second but I did remember this formula for the 275 hp version.

Good luck!

we're pretty close, I'm in Long Beach and my aunt lives in San Pedro.

Sorry for the phone pics, my scanner took a dump.