If you mean to ask if you should replace your 090 heads with 291, the answer is "No".
The 291 casting developed a reputation as the head to have because of it's lower CC combustion chamber volume that produces higher compression with the same pistons. The caveat is the smaller combustion chamber shrouds the valves more and the reduced flow counteracts power gained by increased compression.
You are better off having a more open combustion chamber like the 090 heads and achieving increased compression with piston selection. That way you get both higher compression and better flow.
'72 Jeep Wagoneer Custom, 360 V8
I love how arguements end as soon as Ristow comments. Ristow is right...again.