The cam would be be put in my original engine. My mechanic worked on these engines for many years back in the '90s and early 2000s. With so many worn parts, he thinks I'll be disappointed in the limited performance gains. (I've been considering going to synthetic oil.)
I'm no mechanic, but I keep reading that intake duration at 050 should be 206 or below: lobe separation 112 or above for my 350 engine to idle & run smoothly without having to make any changes with the stock computer. It's not a 305 or a marine 350, if that matters.
If you make changes to the stock engine, it would be advisable to make changes to the stock computer. 10-15 years ago when I played with these trucks all the time, I found altering the stock computer alone to offer more power than a cam or headers in an untuned state.
My point of bringing up the 305 or Marine 350 TBI cams was this. If you do a little math on the cams, you will realize that those 109* LSA cams have less overlap than most 112* LSA aftermarket cams.
The 305 cam is 179/194 @ .050, .350/.385 on a 109 LSA and 106 ICL. It idles at 500 rpm with 20-22 in/hg of vacuum.
The 350 Marine cam is 196/206 @ .050, .431/.451 on a 109 LSA and 106 ICL. It idles well at 550 rpm with 18+ in/hg of vacuum.
I have run a 204/214 @ .050, .423/.446" 112 LSA on a 107 ICL cam in a 350 and it makes about 16-17 in/hg. You can usually get this one to run very well on a stock computer chip, however it runs much better when you dial in the fueling and timing.
When you get into tuning, you can pretty much run whatever cam you want.
My old setup was a 11:1 TPI 383 with a 232/240@ .050, .540/.560" lift, 110 LSA, 106* ICL roller cam. Was being run by a 1995 TBI PCM modified for port fuel. That engine made 12 in/hg of vacuum @ 850 rpm out of gear and about 9 in/hg of vacuum in gear.