Burke; it may not be a tri-power, but it is still a 348.
This may not mean anything to the LR crowd; but it will to the Chev guys you market to.
Chev made one non tri-power version of the 348 in 1958. 250 horsepower, 9.5-1 'Turbo Thrust V8', 4 barrel. It was the largest displacement engine you could get that year.
I think I gave you this site name before, but you should consider listing it on www.348-409.com
Great car. GLWS