Want to build a 77 360 suggestions please

Hi Steve a cam change is not going to do it bottom end will feel even more gutless
describe your headers
since you are going to need new pistons I would
go to the pic a part sale memorial day weekend and grab a 360 with 308 heads (or a late model magnum motor from a wreck)
get a 408 rotating assembly as you are going to do the rods and buy pistons anyway
build your new short block (pump gas friendly)
you will be there with 308 heads and when you get your inheritance you can get some aluminum heads and make really big power
re-read abodybomber's post- you think about a cam and do spring seats and cut down the guides but do pick cam last- and Lunati is one of the few off the shelf choices
keep the build pump gas friendly- the extra cubes helps that
then do a quick engine swap with your current 360 which you can keep as a spare or sell
your recent purchase has most likely been rebuilt and you have no idea what's inside
I'd do two things- compression check and report (does it run without pinging on regular gas?)
and check the timing chain if you have a valve cover off you can check the cam lift and report -- cam could be retarded what ignition, have you done the dist curve?