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Between those two motors, I would favor the L31. You'd be getting the best production Gen1 heads chevy ever made and a roller cam.Have you also considered picking up a used LM7 5.3L engine? It will be more involved, but my guess is you will be happier with the end result. Around here you can pick up a <50K mi 5.3L for $750-900. From there you have the option of upgrading to a 4L60E, 4L65E, 4L80E, or just keeping you 700R4. If I could go back in time, before I swapped my 305 for a Goodwrench 350, this is what I would do.
Between those two motors, I would favor the L31. You'd be getting the best production Gen1 heads chevy ever made and a roller cam.Have you also considered picking up a used LM7 5.3L engine? It will be more involved, but my guess is you will be happier with the end result. Around here you can pick up a <50K mi 5.3L for $750-900. From there you have the option of upgrading to a 4L60E, 4L65E, 4L80E, or just keeping your 700R4. If I could go back in time, before I swapped my 305 for a Goodwrench 350, this is what I would do.
Event, I'm curious as to why you chose going for a 260 HP 350 crate and not instead step to at least the 330-horse Vortec-head motor. Was it cost?
Captkaos has a link to the Car Craft article where they modified the 260 HP crate motor. You could start off with the 260HP and modify it when the budget allows you to.