318/340 questions please help!!

My Duster ran 11.50's, with a Mopar Perf 590/610 roller cam, ported X heads, harland rockers, etc. Shifted it at 7500 with a 3500 stall RPM, with stock steel crank, light duty floating rods, and TRW pistons. Lots of time in that little guy, Hundreds of hours of work on the heads, and the port o sonic.... Don't regret one minute or dollar I out into that 318. Car had 4.88's too, and would eat anything else I ever ran across on the street. Neat little car, I miss it dearly. I actually wonder if anyone here in Lynden WA has a Charcoal Grey 74 Duster ............ One of these days I'll start on my 72, but a ten speed roadranger in my one ton, a five speed OD in my 74 Dually, paint and rear end swap on the wifes ramcharger, and a restore on my sons 70 D200 seem to be ahead of my lil Duster. But I do plan on building a 4" stroke 273 for it, jsut so the nimnims can scoff......... BWAAAHAAAAHAAAAAAAAAA Think of the SNAP that lil motor will have!