Allied input on soviet equippment doesn´t count that much in 1941 (it does exist, but it´s quantity is neglectable) but has a peak in 1942. In 1942 it indeed makes a difference, introducing better radio and gunsights-for example. The importance in 1942 is even more significant, because it was a critical (and for the VVS very difficult) year and soviet production lines behind the Ural were just starting to deliver higher numbers.
The VVS modified much of their land lease equippment, Hurricane with twin Berezin 0.50 cal and twin 20mm ShVak as well as weight reduced P-39 and P-40. But even with these materials, the VVS had a hard time with the Luftwaffe, actually it suffered high losses in 1942.
What makes me feel, the VVS could do well against the RAF is that the tactics of the RAF would bring the fight to a higher altitude, suited for planes like Mig-3. Initially the VVS had not that much of the new planes avaiable but innumerous I-16 and Chaikas, which have a less performance but which could do well gaginst Hurricane. (I-16 against Hurricane would be particularly interesting)
Here additional figures for the "coastel defense force" at june 22nd, 1941:
total:
Arctic force: 114
Baltic force: 707
Black Sea force: 624
I-16/I-15bis/I-153: 691
Yak-1/Mig-3/LaGG-3: 72
DB-3/SB/TB-1/TB-3/Pe-2: 337
MBR-2: 345
As we see, most equippment are older designs. Production figures for newer ones are impressive, even in the second half of 1941, particularly those of the Mig-3.