273/ 2 barrel camshaft options

Just so you know;
I'd run those lifters on any half-decent used 318 cam.
Meaning;
I already have, and it ran for miles and miles and miles, using the old normal-zinc oil.
Heck, If I had a good used 360 cam, I'd run that.
Meaning, I already Have.
And, if you don't like that Idea, you can just convert the valve gear to run hydros.
Meaning, I already have done that too.
Furthermore, I have run uglier lobes than the one in your post.
Just so you know.

But Here's the thing;
Back in those years, decades ago, I was not afraid to go back in at a later date and backtrack. To me, it was just time, (of which, being a young unmarried man, I had lots of) cuz I always had another old cam laying around, and lifters, and etc.
It just never happened.
Your results may vary.

And finally, If you're gonna keep that engine at 8/1 Scr, You need to keep the Intake Closing Angle, at or very near to what the factory had. If it gets to be too much later, you will be thinking of installing a higher-stall convertor, and/or gears soon following.
Just so you know.