I'd swap that out in my 67. Decent price. I'd go for $4k and work up. The LS1 is a GREAT reliable engine with quite a bit (30+%) untapped HP without getting too crazy.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.