[screamingchief]

Much of that is absolutely do-able,but IMO it's kinda gonna be a challenge to do it with that strict 87 octane only requirement.

A 455 with flat tops and 100 cc heads is gonna be like 9.0:1 or just a tic over that.

And then throw in the fact that many high performance type cams will typically end up making more cylinder pressure,and things can end up headed towards risky territory in a big heavy car with a stock converter and 2.73 gears.

And doing something like throwing in a cam that might help the cylinder pressure situation,well that can often end up being a hit-or-miss match to the rest of the drivetrain,so one has to choose a cam like this very,very carefully.

Tough call if you ask me???

Combos like this are often somewhat harder to plan & sort out than the "hotter" combos are.

Most here will likely recommend something like the SD "stump puller" HR cam.

Honestly,,,I dunno what I'd really recommend here,,,I dont really build my stuff like this very much at all anymore...

If it were my car/build,I'd almost certainly be looking long and hard @ the various lobe catalogs,and then ordering a custom ground HR cam.

And I'd probably knock the CR back down to like 8.5:1 to 8.75:1 max to manage that 87 octane requirement.

Though I'm sure some here will debate that advice.

But IMO a .25 to .5 point of CR wont "make or break" a combo like that in terms of it's ultimate performance,but I feel it should buy some leeway in the cam selection choices here,and it almost certainly would'nt hurt the goal to run this strictly on the 87 octane either.

Anyhow,it'll be interesting to see what sorta recommendations you get on this.

Crane used to have some nice smaller HR profiles that would be probably pretty good for a combo like this,I'll have to check my old Crane cam cards for those grinds and get back to you.

Bret P.