Here's an example of an engine I was trying to replicate. It's the Ford Big Six truck motor from 1965. It's 300ci inline 6 (inherently easier torque due to factors surrounding the I6 arrangement) But I don't remember how close it was to the real thing.
One tip, a slightly restrictive exhaust (see photo, the exhaust indicator is very slightly yellowed) along with a cam around 20 to 34 should get you a good, early torque peak. And don't be afraid to drop compression so you can mess around with the ignition timing, as this can also change the torque and hp peaks by a lot.
Concerning ignition timing, I've found values around 55 to 64 can throw the torque peak around anywhere from one hundred to a couple hundred rpm.
CobaltGirl: On a related side note I was trying to replicate the Ford Windsor block v8's in the early 60s. Try getting a 289ci small block with a 4" bore to get a peak hp of 270 ish @6000rpm... There might be a way to fake the system, with just modeling the 289, but I was trying to model more of the family as an automation family with a max of 305ci. (the 351 windsor can be considered a new family due to the change in deck height)
(Side note: is there a size code I can put in the img tag to get the image to display at say 70% of it's full width. I don't want to cut down the pics original size, I would rather just display it scaled down.)