I would agree with Mike's changing it to a single pattern and at the threshold to switch. I spoke with Mike about 18 years ago on speed talk or whatever the site is. I have not been on in years and forgot my password but he wanted to hemi split a cam for me 'More int than exh' and in the 240's... cant remember how narrow it was.
At the time it was 410cid, dual, 1 5/8 headers ... I think it was like 560's & 520 exh 104 or something... I went somewhere else and was happy in the end..not to say it was a dud..I never tried it.
His cam @050 is on the small side imo. It should have a dual plane with that cam, ignore the lift. Probably would crack 500 ft lbs then...and at 6200 wouldnt even be done yet. I turn my port matched plenum corrected ld340 up 7200 rpm with 410cid.
I agree something is off...
So as the conversation goes on.. are we focusing on what's ideal for the cam.. Or the heads and induction.
Simply put.. focus on making the existing better or building around the heads and change intake,cam, maybe headers.