There are 427-441 cid LT-5 strokers now making 700 hp n/a, but this bad boy still has its stock block/stock CR. I came across the vid below because I've been looking to buy a lightly used LT-5 from the '90-'95 ZR-1. They sell for $5-$6K now. MPG... if that's a question. Well, its about the same as an LS motor from what I remember. The LT-5 is arguably the most durable production engine ever built. It was designed that way intentionally.
"In 1990, the ZR-1 set a 24 hour speed endurance record at the Firestone test track in Fort Stockton Texas using a near-stock LT5 engine with only minor modifications, including removal of the catalytic converters. The Tommy Morrison racing team averaged 175 mph (282 km/h), including time for re-fueling and several driver changes."
Plus IMO its got its own exotic way of sounding very nasty; see vid. Good speakers advised.
It's been modded since, but in 2008 it did these #'s.
'91 #1635 Polo Green 350 LT5
11.09 @ 129.27
474RWHP 400RWTQ (with cams swapped, head porting and intake mods, chip etc).
The '90-'95 ZR-1 guys are fanatical in the support of this motor and very willing to help.
http://www.zr1netregistry.com/forum/index.php
This is in a '48 Chevy P/U that was in the mags. I like the understated look... if you can call an LT-5 understated.