Can the Academy 1/32 Viper be used to create a block 25 or 30 variant as well as 40/42/50/52? I saw in the Cybermodeler review of this kit what appears to be small & big mouth intakes in the pics but I could be mistaken. Or, am I restricted to the more expensive Tamiya Thunderbirds kit for the small mouth & P/W engine? Thanks for your help.