You won’t lose torque with lpg (noticeably) but airflow at upper rpm will be limited. You need to get the mixture right using a wideband o2 sensor. A single model E converter will be adequate or even a b2.
Sometimes you may need to change the diaphragm to get the correct mixture.
Is yours a clean air model? Does it have tamper proof (cap screw) adjustment or does it have the screw (idle) and hex (power) adjusters?
With such a small cam you shouldn’t notice a difference in low down power. I have one on my 308 with 206/
[email protected] around .480 lift, Ported VL big valve heads, performer manifold, 10:1 comp approx, extractors etc etc. Has considerably more bottom end and mid than my efi 304 on injected LPG with crane 268, pacies etc. but the 304 is happier to rev, although I think that’s due to heads and intake design rather than fuel system.