I read through the LT-1 Section but am still a little confused I want to do the LT-1 swap on my TBI 305 is there any affordable springs i can get for it that would be available locally? (converting to TPI at the same time) whats the open and closed pressures demanded by the LT-1 cam? and would either of these springs work?
Max Outside Diameter 1.264 Wire Diameter 0.192 Coils 6.4 Closed Height 1.7 Closed Press 104 Open Height 1.21 Open Press 277

or

Max Outside Diameter 1.238 Wire Diameter 0.177 Coils 6.8 Closed Height 1.7 Closed Press 76 Open Height 1.25 Open Press 194.

 

I assume you intend LT1 cam swap. In the LT1 cam swap guide is a part# for suggested springs and ewerithing needet except Air Condition. Best is to get the spring rate and dimension of the suggested springs as reference.