> Dan - I didn't know there were 400/mod blocks with small bolt pattern
> trannys. (in trucks?)
I've only seen them in passenger cars. They are sometimes referred to
as FMX blocks and are fairly rare. Here's a picture of a rusty one:
http://www.bacomatic.org/~dw/fengpix1/odd400.jpg
Notice the skeletal outline of the big block pattern.
> Were they 2 bolt or 4 bolt mains?
2 bolt mains but I think Pro Gram Engineering makes 4 bolt main caps
for them. One of the PAntera guys did one with Webers and a 4 bolt main
conversion.
> All of the modified engines I've found in junk yards had 2V or 4V
> Cleveland open chamber heads, perfect for blower heads.
The stock 351M/400 heads are similar to 351C-2V but have inferior
exhaust ports and some have a water filled passage that can't be ported
away.
Dan Jones