Re: ISO 393w crankshaft with 2.5" rod journals?
The heads are a tad small, but I think you'll be ok. I'm running Windsor Sr's (200cc) and they seem to work fine. I thought I was getting a deal as I picked these up off of Craigslist, but after I went through them, replacing springs and several valves, getting a valve job. I was almost in them as much as a set of AFR's or TrickFlows would have cost. Then I still have to spend several hours with the die grinder cleaning up the ports/bowls.
Anyway, I'm running a Howards Retro Roller cam - Love it.
278/284 .533/.544 lift. Used stock ford roller lifter and spider. Nice lumpy idle. Has plenty of vacuum for the brakes.
I'm getting around 15mpg with the overdrive.
'68 Ranchero 500
'70 Cougar XR-7 Convertible
'98 Mustang GT Convertible