You will need new pushrods, I beleive they are 6.75" or 6.7" inches long however its always best to measure and buy accordingly. When I did the heads on my LX the pushrods in the topend kit were dead nuts on top of the valve so I did not measure them.
Not to mention that the stock pushrods are only 6.272" long. A good rule of thumb with a set of TF Rockers on TF Heads, I would say a 6.7" pushrod. Its exactly what they install with their kits. However that is with the 1.6ratios.
Rule of thumb for ANY engine build, Get a pushrod length checker with a 8" dial caliper. Measure it and order the closest number
To answer your question of are they good heads the answer is yes. As far as gaing 79 hp it probley wont happen with just the heads alone. IMO get yourself some AFR.
99% of the time they will take the 6.700 pushrod, which I just happen to have a set of sitting right here that i'll let go cheap. they are trick flow 6.700 hardned pushrods that are in perfect shape. If your interested pm me or email me at: rnshuble@yahoo.com