Two words: Nitrous Oxide!
I'm building a 250 to about 225 horses and then adding nitrous for a 75 horse bump. Simple math: 300 horses are costing me about $2000. Since my truck is a 1970 I could have shopped wrecking yards for a low milage vintage 327 or 350 and installed it for under a grand. I'd of had more horse power right off and the potential to make even more horses. I would have also had one more small block in a sea of bolt on billet BS. I prefer to spend the money, do the work, and earn the cool points, and nothing says cool in quite the same voice as an I-6 with 3 carbs, split manifold, and nitrous!!
Boo