With some slight changes your engine swap should not be a problem! The 700R4 transmission is a very similar non-computer controlled version of the 4L60E or 4L80E transmission that should have been originally attached to the 1995 Chevy 350 truck engine. 

If the 1995 Chevy truck had a manual transmission you will need to remove the pilot bearing or bushing from the end of the crankshaft and replace the flywheel with a flexplate - 555-601074 

For the intake swap there are bolt adapters available for converting the center four bolt holes from early angled pattern to late straight pattern - 428-52112 but you may have to slot the center four intake manifold holes and the adapters are not very stable. I would recommend either swapping your old style cylinder heads over to the newer block or purchasing the correct intake manifold for the 87-95 cast iron truck heads: Weiand - 925-8170 or Edelbrock - 350-2104  

You can place your order online at www.jegs.com, speak with Customer Service or request Technical Assistance via telephone at 1-800-345-4545 . We look forward to assisting you with your project in the future and if you have any additional questions please feel free to contact us.