I wouldn't get too crazy with power in a Puma. It is basically a pan Speedster.
Yeah, let's throw a 250 hp turbo mill in there. Torsion leaf front suspension, recirculating ball steering box, etc..... Let's throw some turbo power in there, just so you can REALLY upset the very marginal chassis at 180hp, just add 60-70 more. Make sure the brakes are stock too, for that extra pucker factor.
Marty and Ray and Bob can get away with a lot in an IM tube-frame with 911 suspension.
I'd wager the Puma would not do as well.
My two cents.