The fuel injection system works pretty well on these engines, so unless there is some compelling reason to delete it, I would leave it alone. Just swap in some good injectors and you're done. Most likely won't even need to retune if you use the right ones.
A crate 454 would be by far the easiest and most economical option. For every day driving the 6.0 will outrun the big blocks. The big blocks will both easily out tow the 6.0 hauling heavy if that's a deciding factor.
Not sure why you think you might have a broken valve spring/rocker. My experience with expensive-sounding valve train noise in these engines has always revealed the lifters to be the culprit. Severely eroded camshafts crop up sometimes, too.
The L21 gives a more reliable and smoother engine by getting rid of the distributor and associated components. Stutaeng has the conversion process about right. Need to convert to a 411 PCM to run the individual coil packs. Can't remove the distributor - need it to drive the oil pump. A few other details, but it's not terribly complicated. FYI: the L21 has the exact same crankshaft as the L29.
A crate 454 would be by far the easiest and most economical option. For every day driving the 6.0 will outrun the big blocks. The big blocks will both easily out tow the 6.0 hauling heavy if that's a deciding factor.
Not sure why you think you might have a broken valve spring/rocker. My experience with expensive-sounding valve train noise in these engines has always revealed the lifters to be the culprit. Severely eroded camshafts crop up sometimes, too.
The L21 gives a more reliable and smoother engine by getting rid of the distributor and associated components. Stutaeng has the conversion process about right. Need to convert to a 411 PCM to run the individual coil packs. Can't remove the distributor - need it to drive the oil pump. A few other details, but it's not terribly complicated. FYI: the L21 has the exact same crankshaft as the L29.