I only have a couple of books with references for La-5/7
La-7
one source says 2,000hp Shvetsov radial another says 1,850 HP Shvetsov M-82FN (ASh-82FN)
Max speed 413mph, max range 395
or
Max speed 422
Wing span 32ft 1in, Length 28ft 2in, Weight 7496lb, 2 or 3 Beresin B-20 (20mm) cannon.
La-5
1330hp Shvetsov M-82F radial (no other notes)
La-5FN
1,510hp M-82FN or 1,650hp
max speed 403mph
climb rate 5 minutes to 16,000ft
wing area 189 sq ft
Low speed handling is assisted by automatic slats on the leading edges of the wings
I would guess the differences between the La-5FN and La-7 was about 200 to 400hp and probably a cleaner design