Many ways to go.
A fresh 2.7S with sport muffler at about 170hp in a light car is not slow.
A 2.7 w 9.5/1 J&E's, CIS, and C2 cams is a step above.
Just slapping a set of Webber's on a 2.7s and a sport muffler can wake it up.
The classic build is E cams, RS pistons, and Webber's, and sport muffler as outlined in Bruce Anderson's book is good for about 200-210hp.
A twin plug with about 10.1/1 CR, modified S cams, and 36-38mm ports can be a very,very sweet motor can be about 225-250hp.
Still, if you are not making a major commitment to the 2.7 do not waste your time and money. They can be a nice motor if done Right but it takes a solid commitment and a tall stack of Benjamen's to do Right.
Might be better to sell the 2.7 motor for 1-2k and slip in a chipped 3.2 for about $5-6k. 5K is about half the cost a nice 2.7 can be built for and will be a fast car in a light chassis. Say 235hp with big torque.
