The hi-alt Perseus X was good for 880 HP at 15500 ft (on +3 psig), or just a bit better than Peregrine. On 100 oct, max boost was IIRC +5 psig - we might get up to 950 HP, at a perhaps 12000 ft. Much more drag than Peregrine, low amount of exhaust thrust - net 320 mph?
For low level work, the numerous Perseus variats gave 900-950 HP at 3000-5000, pushing with 100 oct perhaps up to 1000 at SL.
There is also the unloved Dagger VIII around. Almost 1200 HP at 7200 ft, 850 at 15000 ft all for 4400 rpm operation, or 800 HP at 15000 at 4200 rpm. The installation on the Hereford, while on paper affording more power than Pegasus, was an unfortunate one. The cooling would be a problem on a slow Hereford, and lack of second speed of the SC will either kill the performance, or force the pilots to use more aggresive power setting for cruising - not good for reliability. The Dagger might allow for easier use of exhaust thrust.
All of the proposed engines block the visibility for the pilot, more than it was the case for the Peregrine. Benefit is that there are no radiators (bar for engine oil) in the wing, so there is much more space for fuel. Stick two automatic 2-pdr guns for AT work, plus 4 Brownings, bombs & rockets and we're set. More costly proposal than Hurricane IID for AT work, but it can do both AT work and bombing/rocketing during a single mission.